Cooling system for sprayers



Feb. 2 1926.

J. c. |-|u| COOLING SYSTEM FOR SPRAYERS Filed June 24. 19 2 Sheets-Sheet 1 3140mm Join 63171!!! J. c. HULL' cooum SYSTEM FOR SPRAYERS 2Shets-Sheet 2 Filed June 24, 1922 II I SW John dial! Patented Feb. 2,1926.

JOHN G I-IULL, OF GASPORT, NEW YORK.

COOLING SYSTEM FOR SPRAYERS.

Application filed June 24, 1922'. Serial No. 570,751.

To all whom it may concern:

Be it known that I, JOHN G. How, a cit-izen of the United States,residing at Gasport, in the county of Niagara and State of New York,have invented certain new and useful Improvements in Cooling Systems forSprayers, of which the following is a Specification.

The invention relates to an improved cooling system for internalcombustion engines used for driving pumps of insecticide sprayinmachines.

It is nowgenerally the custom in the construction of power sprayingmachines to cool the engine by utilizing water fed to the jacket from areceptacle or container positioned adjacent the engine. Such structuresare fairly satisfactory with small types of Sprayers where a low horsepower engine is employed, but with the larger machlnes requirin the useof more powerful engines, this method of cooling does not satisfactorilydissipate the heat. It has been proposed to use radiators in connectionwith such larger types of sprayers, but radiators render the machinesheavy and expensive and occupy vertical spaces which often restrict thetravel of the machine because of narrow paths frequently found inorchards.

The present invention contemplates a cooling system for sprayers,whereby the water passing through the engine jackets is cooled by theinsecticide solution being drawn to the pump driven bythe engine beforethe water is again returned to the engine jacket.

In carrying out my invention I preferably enclose for a portion of itslength the water discharging pipe from the engine cylinder with theconduit through which the insecticide solution travels on its way to thepump so that heat is extracted from this water by the cooled insecticidesolution before entrance again to the engine cylinder. In the use ofspra-yers theeir'gine is frequently running when the spray nozzle isclosed and no solution is being discharged from the pump, and in orderthat the water for the types of apparatus, and for the mere purjacketsmay at all times be properly cooled to prevent an overheatin of theengine, I provide in the pump a re ief valve whereby there is acirculation of the insecticide solution when the spray nozzle is closedand the engine under way to cool the water during such idling of theengine.

My invention can be embodied in many pose of illustration Ihavedisclosed in the accompanying drawings a single apparatus capable ofsupporting the invention.

In the drawings, Figure 1 represents a side elevation of the apparatus.

Fig. 2 is a detail view with parts in section; and,

Figs. 3 and 4. aresectional views of the heat interchanger.

Referring now more particularly to the drawings wherein like referencecharacters indicate corresponding parts, the numeral 1 designates aspraying machine of a well known type, supported by rear wheels 2, andfront wheels 3. The sprayer is preferably horse drawn,although a powerpropelled sprayer may be used. Mounted upon the rear axle of the sprayeris the insecticide receiving tank l, the same being of considerablecapacity, and holdin an insecticide solution consisting of a well knowninsecticide dissolved or suspended in water or any other liquid mediumso as to provide a free flowing mixture. The insecticide is containedwithin the interior 5 of the tank. Disposed in advance of the tank is apump 6, preferably a double acting one which is not shown in section inthe accompanying drawings because the pump per se forms no part of thisinvention. I The function of the pump, however, is to withdraw theinsecticide from the interior 5 of thetank, through the dischargeconduit 7, thence through the enlarged manifold 8 and into the pipe 9.From the pump the insecticide solution is thrown as aspray through thehose 10 provided with asp ray nozzle 11 having a suitable controllingvalve whereby the nozzle may be opened any desired distance or entirelyclosed. The pump is driven by the in ternal combustion engine 12 mountedupon the forward part of the spraying machine. This engine may be of anywell known type having a geared driving connection with the pump foroperating the same during the operation of the sprayer. Manifestly, whenthe pump is in operation, liquid is con stantly withdrawn from theinterior 5 of the tank and if the spray nozzle 11 is open, then thissolution is thrown as a spray upon foliage, trees, or the like. Theinternal combustion engine must be in operation when the pump is inaction and should the sprayingmachine be moved from tree to tree, it isnot always desirable to out off the engine, and in this event the nozzle'11 would be closed while the engine is slowly running the sprayingsolution entering the pump (5, being then forced back to the tankthrough the pressure relief valve 13 in the pump and the return pipe latleading to the tank l. In other words, whenever desirable the engine canrun while the machine is be ing moved from place to place and by merelyclosing the spray nozzle 11 the insecticide solution is in circulationin the circuit defined by the pipes 7, 9, relief valve 13, and returnpipe 14-.

In the use of the larger types of spraying machines, much diliiculty hasbeen expe rienced in properly cooling the pump mo tor. The largermachines utilize a four cylinder motor of a considerable horse powei,and it has heretofore been suggested that a cooling radiator be used.Such a radiator is decidedly objectionable when used on a s n'ayer,first because of its increased e pense and weight, and also because ofthe space necessarily occupied by a radiator which must be verticallydisposed to secure maximum etl'iciency. The use of subn'lergcd pipes orcoils in the spray tank is objectionable on account o't theirobstructing the accessibility of all. parts of the tank for the removalof sediment and its cleansing. The present invention relates solely tothe cooling of the engine of a spraying machine and aims broadly toprovide a structure wherein the heat oil the water passing from theengine jackets is extracted by the spraying solution drawn from the tankat to the pump 6. lVith this end in View the engine is provided with awater discharge pipe 19 that leads to the water tank 16 disposed withinthe solution tank t and either entirely surrounded by the solution.therein or partly surround ed by the solution, depending upon itsheight. Before entering the tank 16 the water in the line 19 passes intoan enlarged chamber 18 which is surrounded by the manifold 8 of the pipe7 through which manifold the solution from the tank passes. It will beap n'eciated that the enlarged chamber 18 presents a heat transferringsurf: ce against which the solution impinges to absorb heat from thewater passing through the chamber 18. After cooling in the tank 16 thecool water is drawn through the line 15 for delivery to the coolingjackets of the engine.

A. very essential embodiment; of this invention resides in the provisionof the relief valve 13, which has a communication between the pump onthe discharge side thereof and the return pipe 14. hen the sprayingnozzle is closed and the engine is running, which frequently happens,when the spraying machine is being moved from tree to tree, the solutiondrawn from the interior of the tank of course passes through the feedpipe 7, through the manifold 8 cooling the water passing to the engine,utter which the insecticide solution enters the pump, escapes throughthe relief valve 18 and pipe ll back to the tank -l-. When the engine isidling in this manner the Water is also being cooled so that nooverheating oi" the engine will occur. it will also be ap preciated thatthe equipment for dissipating the heat of the engine is very light incharacter and occupies no material space in the spraying apparatus.Various types ot pumps and engines may be employed and likewise thecontainer for the spraying solution may be disposed at various positionson the sprayer and the capacity thereof may vary between wide limits.

T he engine is shown as havii'ig a thermo siphon type oi? coolingsystem, although it will of course be understood that a circulating pumpmay be used in the coolii'ig system if desirable.

Having thus described my invention, what I claim is:

1. in a spraying apparatus, the combination with a solution tank, a pumpin communication therewith, a sprayer connected with the dischargeoutlet oi said pump, an explosive engine for driving the pump, means torcooling the engine comprising a water container, a water discharge fromthe explosive engine jacket to said container, and a feeding pipe fromthe container to the explosive engine jacket for introducing waterthereto, said water discharge pipe intersecting the traveling stream ofsolution being conveyed to the pump whereby heat of the water passing tothe engine jacket is absorbed by said solution.

E2. In a spraying machine, the combination with a solution tank, of apump for drawing solution from said tank through a feeding conduit, adischarge from said pump, an explosive engine for driving the pump. andmeans for cooling the engine conmrising a water receptacle, waterdischarge pipe leading t'rom the explosive engine to said receptacle, aatcr teed. pipe leading from the receptacle to a water jacket of theeu-,cgine, said water discharge pipe being sur rounded for a portion of itslength by the solution teeding conduit leading to the pump whereby thetraveling stream of solution entering the pump cools the water passingto the explosive engine jacket.

3. In a spraying machine, the combination with a solution tank, of apump for drawing solution from said tank through a feeding conduit, anexplosive engine for driving the pump, a solution discharge conduithaving a nozzle communicating with the pump and means for cooling theengine comprising a water receptacle, a water discharge pipe leadingfrom the ettplosive engine to said receptacle, a water feed pipe leadingfrom the receptacle to a water jacket of the engine, said Waterdischarge pipe being surrounded for a portion of its length by thesolution feeding conduit leading to the pump whereby the travelingstream of the solution entering the pump cools the Water passing to theexplosive engine jacket, a discharge nozzle leading from the pump,

va relief valve in said pump, and means for returning the solution fromthe pump to the solution tank When said nozzle is closed and the engineidling.

4. In a spraying apparatus, the combination with a solution tank, adischarge conduit leading therefrom, a pump connected with said conduitfor Withdrawing solution from the tank. an explosive engine for drivingsaid pump, means for cooling said explosive engine, comprising a Watercirculating system for introducing and discharging Water to and from theWater jacket, and means in said system for absorbing heat of said Waterin the solution prior to the entrance of the Water to the engine jacket,said means comprising a Water pipe leading from a Water receiver tank tothe engine, and a manifold in the said conduit surrounding a portion ofsaid pipe.

5. In a spraying machine, the combination with a solution tank adaptedto receive a spraying solution, a-pump, and a communication between saidpump and said solution tank, an explosive engine for driving the pump,and means for cooling said engine, comprising a Water circulatingsystem, and means-in said system for absorbing heat of said Water in thespraying solution entering the pump prior to the entrance of the Waterto an engine cylinder jacket, said means comprising a manifold in thecommunication between the pump and solution tank through Which a waterconduit passes.

JOHN C. HULL.

